PCPP-32-101 1.9 Advanced Techniques for Creating and Serving Exceptions PCPP-32-1 Practice Questions (Page 4)

Questions 16–18

1. 16expert · hard

   A senior developer is reviewing a colleague's code that wraps a database error. The code is: try: db.query() except DBError as e: raise APIError("Query failed") from e The reviewer notes that the traceback shows both exceptions. The colleague asks: 'What is the difference between __context__ and __cause__ in this traceback, and what would change if I removed the 'from e' clause?' Which answer is correct?

   • ABoth forms produce identical tracebacks; the only difference is that 'from e' suppresses the original exception from the output.
   • BWith 'from e', the original DBError is not accessible in the except block; without it, the original is accessible via __context__.
   • CWith 'from e', __context__ is set to the DBError and the traceback says 'During handling'. Without it, __cause__ is set and the traceback says 'direct cause'.
   • DWith 'from e', __cause__ is set to the DBError and the traceback says 'The above exception was the direct cause'. Without it, __context__ is set and the traceback says 'During handling of the above exception, another exception occurred'.
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2. 17foundation · easy

   What can you do with the `__traceback__` attribute of an exception?

   • AModify the exception's message
   • BSuppress the exception from being caught
   • CRetrieve the traceback object and extract frame information for debugging
   • DChange the exception type
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3. 18expert · hard

   A monitoring tool catches an exception and needs to extract the filename and line number of the frame where the exception was originally raised, not where it was caught. The exception object is available as 'exc'. Which code correctly retrieves this information?

   • Aimport traceback filename, lineno = traceback.extract_tb(exc.__traceback__)[0][:2]
   • Btb = exc.__traceback__ while tb.tb_next: tb = tb.tb_next filename = tb.tb_frame.f_code.co_filename lineno = tb.tb_lineno
   • Ctb = exc.__traceback__ filename = tb.tb_frame.f_code.co_filename lineno = tb.tb_lineno
   • Dfilename = exc.__file__ lineno = exc.__line__
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